Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
5.52.74-2.90
1
7.18
👆🏻
Fracture
Conchoidal
Uneven, Splintery
Cleavage
{111} Indistinct, {111} Indistinct, {111} Indistinct
Perfect on {100} and {001}
Mohs Hardness
5-5.54.5-5
2
10
👆🏻
Chemical Composition
(Ca,Na) 2Ta 2O 6(O,OH,F)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Ca 2NaHSi 3O 9Ulrich Henn and Claudio C.